新增 Mjpegplayer 用来播放 Web 流

SHH.MjpegPlayer/Core/Extensions/NetHttpExtension.cs

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+using Ayay.SerilogLogs;
+using Newtonsoft.Json;
+using Serilog;
+using System.Text;
+
+namespace SHH.MjpegPlayer;
+
+/// <summary>
+/// 扩展 HttpClient 的 PostJson 方法，用于发送 JSON 格式的数据
+/// </summary>
+public static class NetHttpExtension
+{
+    // Optimized: 统一日志对象
+    private static readonly ILogger _sysLog = Log.ForContext("SourceContext", LogModules.Core);
+
+    // Optimized: 使用静态单例 HttpClient 防止套接字耗尽。注意：生产环境建议配合 SocketsHttpHandler
+    private static readonly HttpClient _httpClient = new HttpClient();
+
+    #region 同步方法 (Sync-over-Async, 谨慎使用)
+
+    /// <summary>
+    /// 发送 JSON 格式的 POST 请求 (同步)
+    /// </summary>
+    public static string PostJson(this object jsonData, string url, int timeout = 2000)
+    {
+        try
+        {
+            // Optimized: 显式调用异步版本并等待，注意在某些上下文可能死锁
+            return PostJsonAsync(jsonData, url, timeout).GetAwaiter().GetResult();
+        }
+        catch (Exception ex)
+        {
+            _sysLog.Error(ex, "Post 同步请求异常: {Url}", url);
+            return string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// 发送 JSON 格式的 POST 请求并反序列化 (同步)
+    /// </summary>
+    public static T? PostJson<T>(this object jsonData, string url, int timeout = 2000)
+    {
+        try
+        {
+            var msg = PostJson(jsonData, url, timeout);
+            return string.IsNullOrWhiteSpace(msg) ? default : JsonConvert.DeserializeObject<T>(msg);
+        }
+        catch (Exception ex)
+        {
+            _sysLog.Error(ex, "Post 同步请求并解析 JSON 异常: {Url}", url);
+            return default;
+        }
+    }
+
+    #endregion
+
+    #region 异步方法 (推荐使用)
+
+    /// <summary>
+    /// 发送 JSON 格式的 POST 请求 (异步)
+    /// </summary>
+    /// <param name="jsonData">要发送的对象</param>
+    /// <param name="url">目标地址</param>
+    /// <param name="timeout">超时(ms)</param>
+    public static async Task<string> PostJsonAsync(this object jsonData, string url, int timeout = 2000)
+    {
+        string jsonString = string.Empty;
+        try
+        {
+            // Optimized: 序列化处理
+            jsonString = jsonData is string s ? s : JsonConvert.SerializeObject(jsonData);
+            using var content = new StringContent(jsonString, Encoding.UTF8, "application/json");
+
+            // Optimized: 设置请求级别的超时处理（HttpClient.Timeout 是全局的，此处利用 CancellationTokenSource）
+            using var cts = new CancellationTokenSource(TimeSpan.FromMilliseconds(timeout));
+
+            var response = await _httpClient.PostAsync(url, content, cts.Token);
+
+            if (response.IsSuccessStatusCode)
+            {
+                return await response.Content.ReadAsStringAsync();
+            }
+
+            _sysLog.Warning("Post 请求状态异常: {Url}, StatusCode: {Code}", url, response.StatusCode);
+            return string.Empty;
+        }
+        catch (OperationCanceledException)
+        {
+            _sysLog.Warning("Post 请求超时: {Url}, Timeout: {Timeout}ms", url, timeout);
+            return string.Empty;
+        }
+        catch (Exception ex)
+        {
+            // Modified: 使用结构化日志记录错误
+            _sysLog.Error(ex, "Post 异步请求发生故障: {Url}", url);
+            return string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// 发送 JSON 格式的 POST 请求并反序列化 (异步)
+    /// </summary>
+    public static async Task<T?> PostJsonAsync<T>(this object jsonData, string url, int timeout = 2000)
+    {
+        try
+        {
+            var result = await PostJsonAsync(jsonData, url, timeout);
+            if (string.IsNullOrWhiteSpace(result)) return default;
+
+            return JsonConvert.DeserializeObject<T>(result);
+        }
+        catch (Exception ex)
+        {
+            _sysLog.Error(ex, "Post 异步请求解析 JSON 失败: {Url}", url);
+            return default;
+        }
+    }
+
+    #endregion
+}